Mark Zuckerberg launched a new app for celebrities — and Captain Kirk immediately blasted it with his phaser.

OK, so it wasn’t a phaser. It was a blog. Still, Facebook’s new app for famous people to interact with fans free of other Facebook clutter, called “Mentions,” had only just been released when actor William Shatner tore it down on his Tumblr blog.

“I’m not quite sure why Facebook released this app for ‘celebrities,’ ” Shatner said on the blog. “It seems to be ill-conceived.”

Among his complaints: Mentions requires its “actors, athletes, musicians and other influencers” to follow other celebs as part of the registration process.

And the first celeb Facebook recommended to Shatner? Why, his old “Star Trek” nemesis George Takei.

“Rolling my eyes,” Shatner wrote about Facebook’s awkward suggestion that he follow Takei. The Priceline spokesman chose Robert Downey Jr. instead — and then hid his posts, he said.

“I think that is a big flaw in the set-up. If this app is for celebrities then WHY force them to follow another celebrity in order to set up this app?” Shatner groaned.